I would like to use an 11970W external mixer on my 8562E : impossible to find the signal identifier in the various menus. Looking at the user manual gave the astonishing answer : present if software revision <920528 or option 008. Funny : if I fit this old revision (I have 97XXXX) cal is impossible as the TAM is not compatible with 8562E !!!. An idea to solve an absurd problem ? Thank you.